also build 22.11 in ci again

.github/workflows/build.yml

@@ -6,6 +6,12 @@ on:
     - cron:  '51 2 * * 0'
 jobs:
   images:
+    strategy:
+      fail-fast: false
+      matrix:
+        tag:
+          - nixos-22.11
+          - nixos-unstable
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
@@ -13,6 +19,6 @@ jobs:
       with:
         nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz
     - name: Build image
-      run: ./build-images.sh
+      run: ./build-images.sh "${{matrix.tag}}"
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}